The Reptilia 13" Handguard features patented turn buckle technology and M-LOK configuration for superior modularity and secure mounting on AR-15/M4 upper receivers.Reptilia 13" M-LOK Handguard - BlackPatented turn buckle technology for enhanced performanceBillet 7075-T6 Aluminum ConstructionMIL-STD Type III Class 2 Hard Anodize finishCompatible with all M4 upper receiversIncludes required barrel nut and hardwareMade in the USAEngineered for tactical applications and sport shooting this handguard delivers exceptional durability and versatility with its premium aluminum construction and innovative mounting system.